Features and Benefits
- Input voltage range: 2.3 V to 5.5 V
- LDO input (VIN2) 1.65 V to 5.5 V
- Buck output voltage range: 1.0 V to 3.3 V
- LDO output voltage range: 0.8 V to 3.3 V
- Buck output current: 600 mA
- LDO output current: 300 mA
- LDO quiescent current: 22 μA with zero load
- Buck quiescent current: 20 μA in PSM mode
- Low shutdown current: <0.3 μA
- Low LDO dropout 110 mV @ 300 mA load
- High LDO PSRR
- 65 dB @ 10 kHz at VOUT2 = 1.2 V
- 55 dB @ 100 kHz at VOUT2 = 1.2 V
- Low noise LDO: 40 μV rms at VOUT2 = 1.2 V
- Initial accuracy: ±1%
- Current-limit and thermal overload protection
- Power-good indicator
- Optional enable sequencing
- 10-lead 0.75 mm × 3 mm × 3 mm LFCSP package
The ADP2140 includes a high efficiency, low quiescent 600 mA stepdown dc-to-dc converter and a 300 mA LDO packaged in a small 10-lead 3 mm × 3 mm LFCSP. The total solution requires only four tiny external components.
The buck regulator uses a proprietary high speed current-mode, constant frequency, pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2140 has a power saving variable frequency mode to reduce switching frequency under light loads.
The LDO is a low quiescent current, low dropout linear regulator designed to operate in a split supply mode with VIN2 as low as 1.65 V. The low input voltage minimum allows the LDO to be powered from the output of the buck regulator increasing efficiency and reducing power dissipation. The ADP2140 runs from input voltages of 2.3 V to 5.5 V allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cell, PCMCIA, and other standard power sources.
ADP2140 includes a power-good pin, soft start, and internal compensation. Numerous power sequencing options are user-selectable through two enable inputs. In autosequencing mode, the highest voltage output enables on the rising edge of EN1. During logic controlled shutdown, the input disconnects from the output and draws less than 300 nA from the input source. Other key features include: undervoltage lockout to prevent deep battery discharge, soft start to prevent input current overshoot at startup, and both short-circuit protection and thermal overload protection circuits to prevent damage in adverse conditions.
When the ADP2140 is used with two 0603 capacitors, one 0402 capacitor, one 0402 resistor, and one 0805 chip inductor, the total solution size is approximately 90 mm2 resulting in the smallest footprint solution to meet a variety of portable applications.Applications
- Mobile phones
- Personal media players
- Digital camera and audio devices
- Portable and battery-powered equipment
Markets and Technologies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
This product has individual evaluations boards at specific voltages or with specific features as well as the RedyKit™. The RedyKit simplifies product evaluation by providing two assembled and tested evaluation boards, plus a full set of product (voltage) options for an IC regulator. All the IC options come sorted and stored in the kit with the Analog Devices part number clearly printed on each antistatic zip-top bag.
Simple device measurements such as line and load regulation, dropout, and ground current can be demonstrated with just a single voltage supply, a voltmeter, a current meter, and load resistors.
Features & Benefits
- Two fully assembled and tested evaluation boards per kit
- Full set of IC voltage options in each kit
- 3 samples of each IC voltage option packed in separate antistatic bags
- Kit allows the user to quickly evaluate all IC voltage options
- Only need to order one kit per product family
Documentation & Resources
Tools & Simulations
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.